Improvement in drilling-machines



E. J. WORCESTER BL A. F. PifniNTicEf` Improvement in Drilling-Machines.

No. 127,132, U "Patnte'dfwlay'21;8725

1M-Maw umaMAPN/c 2a N, 1. (UsaoH/vss PROCESS).

UNITED STATES PATENT OFFICE.

EDWARD J. WORCESTER AND ALBERT F. PRENTIOE, OF WORCESTER, MAS- SAOHUSETTS, ASSIGNORS TO ALBERT F. PRENTIOE, VERNON F. PREN- TIOE, AND IRA W. JONES, OF SAME PLAGE. g

iMPRovEMENT IN DRILLING-MACHINES.

To all whom it may concern:

Be it known that we, EDWARD J. WoRcEs- TER and ALBERT F. PRENTIGE, both of the city and county of Worcester and Gommonwealth of Massachusetts, have invented certain new and useful Improvements in Drills; and we do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing which forms a part of this specication, and in which- Figure l represents a front view o'f our improved drill, and Fig. 2 represents a side view of the same.

The nature of our invention consists in the combination and relative arrangement with the supporting-frame and drill-spindle of driving and regulation shafts, operating gears, and balance -wheeh all constructed and arranged for operation as shown in the accompanyin g drawing and hereinafter described.

On the drawing, the part marked A represents the frame. B indicates the drill-spindle, which is supported in the bearings a a. C indicates the feeding-screw, connected to the upper end of the spindle B by a loose coupling, O', and arranged through the center of a revolvin g quill, D, which is supported in the bearing b at the upper part of the frame. The screw C is prevented from turning by a pin, c, which projects from the rear side of the screw and works in a groove on the frame A, while the quill D is revolved by the action of the pawl d upon its ratchet-wheel D', and serves as a nut upon the screw G for moving the drill-spindle B. E indicates the crank-shaft, from which motion is transmitted to the drillspindle B by means of the bevel-gears F Ff;

. the latter being connected with the spindle B byaspline and groove. Shaft E isl supported in the bearings a/ a', and is provided with a crank, E', which crank can be adjusted to a greater or less length to increase or diminish its leverage, as speed or power may be desired. G indicates a balance-wheel for regulating the power and giving momentum to assist in carrying the crank past the dead-points. The

pawl d and ratchet DI; said lever is fulcrumed on a projecting portion, g, ofthe frame A, and

is actuated by a cam, M, on the crank-shaft, substantially as -in the ordinary manner.

By constructing and arranging the parts as herein shown and described a very compact and convenient drill is produced, and one which is quite easy of operation, as the balance-wheel G, which revolves rapidly, greatly assists in carrying the crank past the dead-points, and thus enables the operator to run the drill with a steady and uniform motion, while, at the same time, by arranging the spur-gears E I and bevel-gear F upon one side of frame A and the balance-wheel G upon the other side of said frame, but little space, comparatively, is taken up or occupied outside of the frame A by the mechanism for giving motion to and regulating the action of the drill-spindle B.

Having described our improved drill, what we claim therein as new and of-our invention, and desire to secure by Letters Patent, is

The combination, with the frame A and drill spindle B, of shafts E K, gears F F" H I, and balance-wheel G, said parts being constructed and arranged in relation to each other, substantially as shown and described.

EDWARD J. WOROESTERB ALBERT F. PRENTIOE.

Witnesses (Enns. H. BURLEIGH, Tiros. H. DODGE. 

